Answer / hg

1) if any one ct saturates at through fault current due to
a) high harmonic content of current in through fault current leading to high voltage appearing across secondary and the ct saturates

2) under above scenario if there is no stabilizing resistor/ damage to stabilixing resitor than relay may operate

Answer / k.prakashchandra

This may happen when bushing neutral ct is used for REF , as it is usually not identical to the line ct s

In one plant id fan and fd fan are used for boiler. boiler is used to heat water after some days they install one tank to heat water by hot flue gases coming out from boiler and then hot flue gases are used to heat the air coming from fd fan before leaving out from chimney . but hot flue gases are not coming out from id fan what might be the reason?

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